Listing adding machine



Feb. 1. 1938. P. CROSMAN LISTING ADDING MACHINE Filed Jan. 23, 1937 2 Sheets-Sheet 1 INVENTOR Crosma n Eon/ g]? ATTORNEY Feb. 1, 1938.

L. P. CROSMAN LISTING ADDING MACHINE Filed Jan. 25, 1937 2 Sheets-Sheet 2 VENTOR wfimm Patented Feb. 1, 1938 UNITED STATES PATENT OFFICE us'rnva ADDING mom Application January 23, 1937, Serial No. 122,002

1 Claim. (Cl. 101-93) The invention has relation to listing adding machines or the like, and more particularly to ribbon control means therefor. It has been previously proposed in the art, wherein an inked 6 ribbon is interposed between movable type members and the usual platen roll, 'to rockthe type bars toward the ribbon and platen, after selection has taken place and prior to a printing action.

10 It is the object of the present invention to provide means whereby the ribbon is normally held away from the platen, to facilitate insertion of the record sheet upon the platen.

Another object is to improve visibility of the printing line.

To provide maximum spacing between the ribbon and the platen, with a minimum of movement of the type members toward the platen, the ribbon will normally be held against the type members, and another object of the invention is to provide means whereby the ribbon will be first moved toward the platen in anticipation of a setting movement of the type members.

The invention consists in the novel construction and combination of parts as setforth in the controlling bail and associated parts.

General operation Theadding machine to which the invention is shown as applied is of well-known construction, disclosed in its essential structure in U. S. Patent No. 1,932,013, issued October 24, 1933 to .Loring P. Crosman.

For each denominationalorder, the machine a is provided with a three-armed actuator lever,

' numbered 510 on the drawings,. (Fig. 2) these levers being loosely mounted on a shaft 608. The forward arm of each lever 610 terminates in a segmental registering rack; the rearward arm 0 has a lister type bar 6 pivoted thereto, and the upper arm has pivotal connection with a differential stop bar BIS cooperating with a bank of digit keys 215 to limit 'themovement of the lever 610.

u The digit keys 215 which have been depressed 'to represent a value are latched in depressed position with the bottoms of their stems lying in the path of movement of the related stop lugs of the bars 6l5, allowing saidbars to advance a distance proportional to the value of the key, 5 upon operation of the machine. Depression of a digit key will also remove a column latch 2 from the path of movement of its related bar 615, these latches preventing movement of a stop bar and lever M0 in any column in which no 1 key is depressed.

A rock shaft l is provided with cam means 3H! for governing the movement of a spring tensioned rocker frame H6, mounted on shaft 608, frame 615 carrying a series of dogs 611 normally engaged by studs 659 of the levers H0. As shaft 301 is rotatedforwardly, frame GIG will be rocked, and any of the levers 6 l 0 which have been released by the depression of digit keys will be allowed to rotate, under the influence of their 20 springs 683, until they are stopped by the lugs of bars 6|5 contacting the stems of the keys. Upon vrearward rotation of shaft 301, the dog 611 will return the operated levers 610 to normal position. This excursion of the levers 0I0 serves to 25 register amounts set in the keyboard upon one or more accumulators 403 and to set up a similar amount on the printingline of the type bars. Before the return of the operated levers 510 by the frame 616, spring ,type hammers "5 will be released to print-the item on the record sheet.

The type hammers "5 are adapted to' be operated by spring actuators 100, but are normally held in tensioned position by latches 10l When a type bar is lifted, a tripping finger 102 is allowed to move into engagement with the corresponding latch 101, and at the end of the forward rotation of shaft 301, a frame upon which the tripping fingers are mounted is moved forwardly, 4o releasing the hammers from those latches which have been engaged by the fingers 102. In order to print the zero characters in the lower order places wherein no amount from 1 to 9 has been set up, the higher order latches 101 are provided with offsets 103, lying in the planes of and designed to trip the lower order latches.

The hammers are restored and relatched during the return rotation of shaft 3! by means of I a bail 101, operated through a reciprocatory cam arm 303, fastto shaft 302, upon which is secured an arm 321, having link connection 32| with the reciprocatory arm 316 fastto shaft'30l.

Arm 3l6 and shaft 301 are oscillated by mean of an. electric motor oo connected through a clutch with a crank arm I05, connected to arm 356 by means of a connecting rod I08, so that as crank arm I05 is rotated said arm and shaft 30! will be oscillated.

The spring tensioned clutch pawl I53, pivotally mounted upon crank arm 05, is normally held out of engagement with a notched disk I51 (having drive connection with motor I00) by means of a lever 08 normally held in engaging position with pawl 553' by means of a latch II2. Latch H2 is controlled by means of a trigger H3, lying in the path of movement of the stem of an operating key H4. Upon depression of key H4 trigger H3 will release latch H2 and clutch lever i03 under influence of spring III will be pulled out of engagement with the clutch pawl I53 to start the machine in operation.

Upon release of key M 4 latch II2 will return under spring action into latching position, and toward the end of the cycle of operation an arm I I5 connected with the crank arm l05 will contact with a tooth l iii of. the clutch lever I06 and will force said lever back into latching position, bringing the end of lever I06 into the path of movement of the rotating clutch member I53 to unclutch the machine.

Ribbon control (general operation) Rotatably supported in a bail 304, pivotally mounted upon shaft 302 (Figs. 1 and 3) is a shaft 305 having fast thereon two opposed arms 306 and 301. Arm 306 has pin and slot engagement 308 with a lever 309, pivotally mounted upon the framing at 3H9, and normally held against clockwise rotation by means of a pin 324 fixed in the total segment BIB which is also pivotally mounted at 3I0 and hereinafter to be described.

Pivoted at 3 upon the arm 301 is a slide 3I2 supported at its rearward end by a suitable slot in projection 3I3 of a bracket 3M secured to fixed rod 3E5. Rearward end of slide 3|2 has engagement with a projection 3l1 of the ribbon support bail 300, pivotally mounted at 3I9 upon a bracket 320 secured to the rear framing of the machine. Bail 300 is urged in clockwise rotated direction by a spring 322- and is normally held in counter-clockwise position, away from the platen 323, by the slide 3I2, arm 301, bail 304 (normally held against clockwise rotation by the engagement of the projection 32B of said bail with arm 303), arm 306, pin 308, arm 309 and the pin 324, as shown in Fig. 1.

During the first portion of the forward stroke of arm 3I6 in a machine cycle, arm 303 will move away from projection 326, releasing bail 304, whereupon bail 300 will rotate clockwise under influence of spring 322 to bring the ribbon 328 a roller 330, fixed in said arm, will engage the.

. camedge 33I of a bail 332, pivotally supported in the framing at .333, and impart a clockwise 0 rotative movement to said bail, rocking the type bars 8H toward the ribbon 328 and platen 323.

The hammers 1I5 are then tripped to print the item on the record sheet, as previously described,after which arm 303, in its return stroke, will release bail 332, whereupon said bail under Ribbon control (total printing) A total is taken by releasing the diiferential stop bars 6I5, allowing them to rotate'the accumulators subtractively until suitable pins 451 on the accumulator wheels contact with zero stop members 6I3 as hereinafter described. This will set the total in the type bars, and the hammers will be tripped to print the total. The bars 6I5 are then reengaged with the oscillating frame and during the return stroke of said frame are moved rearwardly to normal position, the accumulator wheels being disengaged from the racks before the return stroke is made, whereby the register which has been totalized will stand at zero. I

Depression of the total key 218 will not only trip the latches 2I4, through pin 263 and rocker 221, but will also trip the latch 620, by operation of acontrol arm 62I, pivotally connected to said latch. Latch 820 normally engages a lug on total segment BIB, preventing movement of said segment under the influence of the total spring 68L Upon tripping of the latch, segment 6I8 will operate a shaft 601 having a spirally arranged row of pins I, acting to trip the latching dogs 6I1 successively from right to left of the machine, the tripping of said dogs releasing the segments and also releasing stop members 6I3, so that they will fall into the path of the zero stops 451 on the accumulator wheels. When this zeroizing operation has progressed to the left hand side of the machine, a pin 60I fast to a rearwardly extending arm of the total segment 6I8 will contact with a projection 802 of a rod I30 connected at its other end to latch II2, releasing said latch to start the machine. The machine being put in operation, the differential stop bars 6I5 will be relatched, the hammers will be tripped, and the parts restored to normal position.

Since as above described, the type bars 6H are moved to set position prior to a machine cycle of operation, the following means are provided to move the ribbon 320 away from the type members before said members are set. As previously described a pin 324 mounted in total segment SIB has engagement with a projection 325 of arm 309, holding said member against clockwise movement under the influence of spring 322. Upon release of segment 6I8 pin 324 will be carried away from projection 325, releasing arm -309, whereupon spring 322 will rotate bail 300 clockwise to bring the ribbon 328 adjacent platen 323, the slide 3I2 moving forwardly and rotating 'arms 301, 306 about point 305.

During the forward stroke of a total cycle,

segment 6I8 will be restored, by engagement of pin B03, fast to reciprocatory cam 3I8, with the restoral arm 604 pivotally mounted at 605 upon the segment 6I8. Upon return of segment H8 pin 324 will reengage projection 325 to restore arm 309. However, as previously described, arm

303 will have released projection 326 of bail 304 and as arm 309 is caused to be rocked counterclockwise the arms 306, 301 will take their pivot about point 3| I, rocking bail 304 clockwise about shaft 302, the slide 3l2 thus remaining in forward operated position until near the completion of the cycle, when arm 303 in reengaging projection 326 will restore bail 304 and slide 3l2, to again bring the ribbon to normal position,

19 shown in Fig. 1, free of the platen 323.

I claim: In a listing computing machine, the combination with operating means, printing hammers, differentially settable type bars, a platen, a ribbon guide, and an ink ribbon normally held by said guide against the type and spaced from the platen, of means engaging and normally restraining said ribbon guide but operable under control of the operating means to move the ribbon radially of and towards the platen, said operating means being timed first to control movement of the ribbon and thereafter to set the type bars 10 and to cause operation of the hammers.

LORING PICKERING CROSMAN. 

